How to solve
The slope of the secant through (a, f(a)) and (b, f(b)) is the average rate of change [f(b) − f(a)] / (b − a).
Steps
- Read the coordinates of A and B.
- Compute rise: f(b) − f(a).
- Divide by run: b − a.
Example
A = (−1, 1), B = (2, 4) on y = x².
- Rise = 4 − 1 = 3.
- Run = 2 − (−1) = 3.
- Slope = 1.
Answer: 1
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